Development of poly(3‐hydroxybutyrate‐co‐3‐hydroxyvalerate)/boron nitride bionanocomposites with enhanced barrier properties

Abstract

This research aims at improving barrier properties of poly(3-hydroxybutyrate-co-3-hydroxyvalerate), PHBV, by incorporating boron nitride particles (BNPs) via melt compounding. To meet this objective, PHBV nanocomposite samples containing different BNPs were prepared and the effects of BN loading and silane surface modifier on the barrier properties of PHBV nanocomposites were investigated. For all the nanocomposite samples, the permeability is decreased in comparison to the neat PHBV due to both the presence of BN particles and a higher crystallinity. The results demonstrate that barrier properties of the composites were found to increase more for the silanized flake type BN (OSFBN) compared to silanized hexagonal disk type BN (OSBN). The best barrier properties are obtained for the nanocomposite sample containing 2 wt% OSFBN, for which a reduction of oxygen permeability up to 36% was observed in comparison to the neat PHBV. Silane-treated BN nanoparticles yielded nanocomposites characterized by good barrier performance and fine BN dispersion, as shown by SEM investigations. The phenomenological gas permeation models were employed to evaluate the effect of BN particles on oxygen transmission properties. The best approach was found for the relative permeation by using Cussler and Lape models. POLYM. COMPOS., 00:000-000, FIG. 1. SEM micrograph of boron nitride particles: untreated BN (a), treated OSBN (b), untreated FBN (c), treated OSFBN (d).

The Effect of Boron Nitride on the Thermal and Mechanical Properties of Poly(3-hydroxybutyrate-co-3-hydroxyvalerate)

“…This research is in the continuity of our study on the improvement of the properties of PHBV by incorporating boron nitride particles with a twin-screw extruder so that it could be transferred to industry for large-scale production. In our previous work, h-BN were studied as the potentially interesting material for the enhancement of barrier properties of PHBV [ 34 , 35 ]. Based on our preliminary results, the aim of this work was to investigate the mechanical and thermal properties of PHBV composites by taking into consideration the effect of different BN nanoparticles.…”

Oxygen Barrier and Thermomechanical Properties of Poly (3-hydroxybutyrate-co-3-hydroxyvalerate) Biocomposites Reinforced with Calcium Carbonate Particles

“…The tests were conducted at 23 °C, 0% relative humidity and 1 atm pressure with highly purified oxygen (99.99%) and nitrogen (99.99%) gases. 4 Analysis was terminated when OTR graphics reached the steady condition. The permeability (OP) was calculated by multiplying the measured steady state transmission rate by the average sample thickness.…”

“…OP is the rate of oxygen transmission through unit area of a flat material of unit thickness induced by unit vapour pressure difference across the material. Relationship between OTR and oxygen permeability were given by the following equation: (4) where OP is the oxygen permeability coefficient (cc mm m -2 day -1 ), OTR is the oxygen transmission rate (cc m -2 day -1 ), L is the film thickness (mm) and ∆P is the difference (bar) between oxygen partial pressure across the film. As shown in Figure 9, the OP of PHBV has a value of 1.35 (cc mm m -2 day -1 ) at 23 °C and the incorporation of calcium carbonate into polymer matrix decreases gas permeability.…”

“…TiO 2 particles act as a nucleating agent for PHB 1 . Öner et al 3,4 studied the effect of h-BN as the potentially interesting material on the enhancement of properties of PHBV. The resulting PHBV nanocomposites showed an increase in oxygen permeability, thermal stability and crystallinity.…”

“…The resulting PHBV nanocomposites showed an increase in oxygen permeability, thermal stability and crystallinity. 3,4 The effect of adding an electrospun PHBV/CuO coating over compression molded PHBV films on the different properties of nanocomposites were investigated. CuO addition using electrospinning enhanced the nanoparticles dispersion but did not significantly modify the oxygen permeability, mechanical or optical properties.…”